Harley-Davidson Fat Boy

The Harley-Davidson Fat Boy is a V-twin Softail cruiser motorcycle with solid-cast disc wheels, designed by Willie G. Davidson and Louie Netz. Harley-Davidson built a prototype in Milwaukee for the Daytona Bike Week rally in 1988 and 1989, and production models from 1990 to 2017 carry the code FLSTF, followed by FLFB and FLFBS from 2018. It was one of many models built on the Softail frame, whose design Bill Davis patented in 1976 and sold to Harley-Davidson in 1982. Its engines grew from the 1,450 cc Twin Cam of 2000 through 1,584 cc and 1,690 cc versions to the Milwaukee-Eight engines of 2018 and later, and a Milwaukee-Eight 117 arrived for 2025. The name is often said to join Fat Man and Little Boy, but the company's styling chief has said it simply describes the bike's width. The Fat Boy is among the company's best sellers and appeared in Terminator 2: Judgment Day.